drowsy — 1520s, probably ultimately from O.E. drusan, drusian sink, also become languid, slow, or inactive (related to dreosan to fall ), from P.Gmc. *drus (see DREARY (Cf. dreary)). But there is no record of it in M.E. Related: Drowsiness … Etymology dictionary

drowsy — adjective a) Inclined to drowse; heavy with sleepiness; lethargic; dozy. I was feeling drowsy and so decided to make a cup of coffee to try to wake myself up. b) Disposing to sleep; lulling; soporific. It was a warm, drowsy summer afternoon … Wiktionary